14 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 7» 



cell long, not dilated in its apical portion, Ksi arising rather far 

 from the end of it. Posterior wings comparatively feebly dilated in 

 the anal region ; membrane forming short prominences at the ends of 

 Ai, A2, A3; the hairs of anal region thin, yellowish; apical portion 

 comparativel}^ long, as in forewings, discoidal cell long, RS arising 

 before its end, as in the anterior wings; membrane granulose. 

 Abdomen yellowish brown above, paler beneath, 



Fetimle: Genital segments formed as in Pseudosteno'phylax ininor 

 Martynov, but with some differences. Eighth segment large, with 

 dark concave hind side-margins in its ventral portion, as usual. 

 Ninth segment as in minor, but not so high; its ventral portion 

 (supragenital plate) broad, but short, tapering hindwards; hind 

 portion subdivided by a short narrow excision posteriorly into two 

 rounded lobes; seen from the side it appears as being rather square, 

 pale. Tenth segment is subdivided by a triangular excision pos- 

 teriorly into two lateral portions, each forming a short and very 

 slender pale process, with apex turned somewhat upward; beneath 

 these processes the hind margin of the tenth segment, viewed lat- 

 erally, forms an oval prominence, separated by a deep excision from 

 the upper processes. Median lobe of the subgenital plate small, 

 capitate, narrow at its base ; side lobes dark, larger, tnmcate at their 

 inner posterior edges, similar to those in minoi\ 



Male: Eighth segment large as usual, in its posterior portion 

 clothed above with minute black spinules. Preanal appendages rather 

 long, cylindrical, brownish above and bearing several long erect black 

 hairs. Ninth segment with concave posterior lateral margins; the 

 portions corresponding to the lateral lines of abdomen are very thin 

 and pale on hind portions of the segment, thus subdividing the sides 

 of the ninth segment into dorsal and ventral portions; the dorsal 

 portion is subtriangular and clothed with long hairs. Inferior ap- 

 pendages form two very broad plates, truncate and somewhat concave 

 at their hind margins; at their base they are somewhat narrower 

 than at their ends; hind portions with long hairs. Tenth segment 

 forms a large projection backward, by the narrow and deep median 

 excision posteriorly subdivided into two side portions; each of these 

 portions forms above a strong brown thickening, triangular if seen 

 from side; seen from above these thickenings appear to be narrow 

 distally, but broad in their proximal portions; the proximal edges 

 obliquely truncate and black. Penis not exserted in our specimens; 

 its hind portion is rounded and brown; titillators composed of two 

 portions, as usual; distal portions are long, arcuate, but slender to- 

 ward their base especially ; their hind outer edges bear rows of short 

 spines and spinules. Length of body, 11 to 12 mm. 



